Because for many, Netflix subscription is a shared good. E.g. I pay for the highest plan, and let my wife, my mom & my siblings use it. I'm not going to ask all of them every month if they're using it; I just pay $15 and everyone can watch whenever they feel like it.
There's a lot to be said for reliability factor too. I could pay for just the middle tier and handle occasional collisions (more people wanting to watch at the same time than the service tier allows). But it's easier to fork out extra $5 and avoid the issue altogether.
There's a lot to be said for reliability factor too. I could pay for just the middle tier and handle occasional collisions (more people wanting to watch at the same time than the service tier allows). But it's easier to fork out extra $5 and avoid the issue altogether.